Electric Field Mapping Lab

Compute values for the electric field at four different points on the point-line plate. Comment on the validity of your values.

2. Relevant equations

E = F/q
ΔV = ∫E dot ds

3. The attempt at a solution

I have attached 3 electric field maps that I did in the lab and I also have a data table with voltage after the 7 resistors (E1 - E7). I just don't understand how I can calculate the electric field with what I have.